Novel external-cavity laser using interference filter as wavelength-selecting component for DWDM applications

In this paper a novel external cavity laser with interference filter as wavelength selective component is introduced. Effective reflection coefficient for compound cavity and static operation characteristics of the laser are analyzed theoretically. Experimental results show that precise wavelength lasing with side mode suppression ratio more than 40dB and spectral linewidth nearly 0.2 nm at -20dB is realized. And the wavelength stability of the laser is also dramatically improved.